487 lines
22 KiB
C++
487 lines
22 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2013 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkotherH
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#define checkotherH
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//---------------------------------------------------------------------------
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#include "config.h"
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#include "check.h"
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#include "settings.h"
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class Token;
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class Function;
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class Variable;
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/// @addtogroup Checks
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/// @{
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/** @brief Various small checks */
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class CPPCHECKLIB CheckOther : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckOther() : Check(myName()) {
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}
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/** @brief This constructor is used when running checks. */
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CheckOther(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {
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}
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/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Checks
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checkOther.warningOldStylePointerCast();
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checkOther.invalidPointerCast();
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checkOther.checkUnsignedDivision();
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checkOther.checkCharVariable();
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checkOther.strPlusChar();
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checkOther.checkRedundantAssignment();
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checkOther.checkRedundantAssignmentInSwitch();
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checkOther.checkSuspiciousCaseInSwitch();
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checkOther.checkSelfAssignment();
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checkOther.checkDuplicateIf();
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checkOther.checkDuplicateBranch();
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checkOther.checkDuplicateExpression();
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checkOther.checkUnreachableCode();
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checkOther.checkSuspiciousSemicolon();
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checkOther.checkVariableScope();
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checkOther.clarifyCondition(); // not simplified because ifAssign
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checkOther.checkSignOfUnsignedVariable(); // don't ignore casts (#3574)
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checkOther.checkIncompleteArrayFill();
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checkOther.checkSuspiciousStringCompare();
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checkOther.checkVarFuncNullUB();
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checkOther.checkNanInArithmeticExpression();
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checkOther.checkCommaSeparatedReturn();
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}
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/** @brief Run checks against the simplified token list */
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void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) {
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CheckOther checkOther(tokenizer, settings, errorLogger);
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// Checks
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checkOther.oppositeInnerCondition();
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checkOther.clarifyCalculation();
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checkOther.clarifyStatement();
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checkOther.checkConstantFunctionParameter();
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checkOther.checkIncompleteStatement();
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checkOther.checkCastIntToCharAndBack();
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checkOther.invalidFunctionUsage();
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checkOther.checkZeroDivision();
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checkOther.checkZeroDivisionOrUselessCondition();
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checkOther.checkMathFunctions();
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checkOther.checkCCTypeFunctions();
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checkOther.redundantGetAndSetUserId();
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checkOther.checkIncorrectLogicOperator();
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checkOther.checkMisusedScopedObject();
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checkOther.checkMemsetZeroBytes();
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checkOther.checkIncorrectStringCompare();
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checkOther.checkSwitchCaseFallThrough();
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checkOther.checkAlwaysTrueOrFalseStringCompare();
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checkOther.checkModuloAlwaysTrueFalse();
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checkOther.checkPipeParameterSize();
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checkOther.checkInvalidFree();
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checkOther.checkDoubleFree();
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checkOther.checkRedundantCopy();
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checkOther.checkNegativeBitwiseShift();
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checkOther.checkSuspiciousEqualityComparison();
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checkOther.checkSleepTimeInterval();
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checkOther.checkComparisonFunctionIsAlwaysTrueOrFalse();
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}
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/** To check the dead code in a program, which is inaccessible due to the counter-conditions check in nested-if statements **/
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void oppositeInnerCondition();
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/** @brief Clarify calculation for ".. a * b ? .." */
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void clarifyCalculation();
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/** @brief Suspicious condition (assignment+comparison) */
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void clarifyCondition();
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/** @brief Suspicious statement like '*A++;' */
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void clarifyStatement();
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/** @brief Are there C-style pointer casts in a c++ file? */
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void warningOldStylePointerCast();
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/** @brief Check for pointer casts to a type with an incompatible binary data representation */
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void invalidPointerCast();
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/**
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* @brief Invalid function usage (invalid radix / overlapping data)
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*
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* %Check that given function parameters are valid according to the standard
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* - wrong radix given for strtol/strtoul
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* - overlapping data when using sprintf/snprintf
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*/
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void invalidFunctionUsage();
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/** @brief %Check for unsigned division */
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void checkUnsignedDivision();
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/** @brief %Check scope of variables */
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void checkVariableScope();
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static bool checkInnerScope(const Token *tok, const Variable* var, bool& used);
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/** @brief %Check for comma separated statements in return */
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void checkCommaSeparatedReturn();
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/** @brief %Check for constant function parameter */
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void checkConstantFunctionParameter();
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/** @brief Using char variable as array index / as operand in bit operation */
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void checkCharVariable();
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/** @brief Incomplete statement. A statement that only contains a constant or variable */
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void checkIncompleteStatement();
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/** @brief str plus char (unusual pointer arithmetic) */
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void strPlusChar();
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/** @brief %Check zero division*/
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void checkZeroDivision();
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/** @brief %Check zero division / useless condition */
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void checkZeroDivisionOrUselessCondition();
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/** @brief Check for NaN (not-a-number) in an arithmetic expression */
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void checkNanInArithmeticExpression();
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/** @brief %Check for parameters given to math function that do not make sense*/
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void checkMathFunctions();
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/** @brief %Check for parameters given to cctype function that do make error*/
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void checkCCTypeFunctions();
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/** @brief % Check for seteuid(geteuid()) or setuid(getuid())*/
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void redundantGetAndSetUserId();
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/** @brief copying to memory or assigning to a variable twice */
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void checkRedundantAssignment();
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/** @brief %Check for assigning to the same variable twice in a switch statement*/
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void checkRedundantAssignmentInSwitch();
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/** @brief %Check for code like 'case A||B:'*/
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void checkSuspiciousCaseInSwitch();
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/** @brief %Check for code like 'case A||B:'*/
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void checkSuspiciousEqualityComparison();
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/** @brief %Check for switch case fall through without comment */
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void checkSwitchCaseFallThrough();
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/** @brief %Check for assigning a variable to itself*/
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void checkSelfAssignment();
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/** @brief %Check for testing for mutual exclusion over ||*/
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void checkIncorrectLogicOperator();
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/** @brief %Check for objects that are destroyed immediately */
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void checkMisusedScopedObject();
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/** @brief %Check for filling zero bytes with memset() */
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void checkMemsetZeroBytes();
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/** @brief %Check for using bad usage of strncmp and substr */
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void checkIncorrectStringCompare();
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/** @brief %Check for comparison of a string literal with a char* variable */
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void checkSuspiciousStringCompare();
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/** @brief %Check for suspicious code where multiple if have the same expression (e.g "if (a) { } else if (a) { }") */
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void checkDuplicateIf();
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/** @brief %Check for suspicious code where if and else branch are the same (e.g "if (a) b = true; else b = true;") */
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void checkDuplicateBranch();
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/** @brief %Check for suspicious code with the same expression on both sides of operator (e.g "if (a && a)") */
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void checkDuplicateExpression();
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/** @brief %Check for suspicious code that compares string literals for equality */
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void checkAlwaysTrueOrFalseStringCompare();
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/** @brief %Check for suspicious usage of modulo (e.g. "if(var % 4 == 4)") */
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void checkModuloAlwaysTrueFalse();
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/** @brief %Check for code that gets never executed, such as duplicate break statements */
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void checkUnreachableCode();
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/** @brief %Check for testing sign of unsigned variable */
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void checkSignOfUnsignedVariable();
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/** @brief %Check for suspicious use of semicolon */
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void checkSuspiciousSemicolon();
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/** @brief %Check for free() operations on invalid memory locations */
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void checkInvalidFree();
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void invalidFreeError(const Token *tok, bool inconclusive);
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/** @brief %Check for double free or double close operations */
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void checkDoubleFree();
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void doubleFreeError(const Token *tok, const std::string &varname);
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/** @brief %Check for code creating redundant copies */
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void checkRedundantCopy();
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/** @brief %Check for bitwise operation with negative right operand */
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void checkNegativeBitwiseShift();
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/** @brief %Check for buffers that are filled incompletely with memset and similar functions */
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void checkIncompleteArrayFill();
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/** @brief %Check that variadic function calls don't use NULL. If NULL is \#defined as 0 and the function expects a pointer, the behaviour is undefined. */
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void checkVarFuncNullUB();
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/** @brief %Check that calling the POSIX pipe() system call is called with an integer array of size two. */
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void checkPipeParameterSize();
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/** @brief %Check to avoid casting a return value to unsigned char and then back to integer type. */
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void checkCastIntToCharAndBack();
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/** @brief %Check providing too big sleep time intervals on POSIX systems. */
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void checkSleepTimeInterval();
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/** @brief %Check for using of comparision functions evaluating always to true or false. */
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void checkComparisonFunctionIsAlwaysTrueOrFalse(void);
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private:
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bool isUnsigned(const Variable *var) const;
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static bool isSigned(const Variable *var);
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// Error messages..
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void checkComparisonFunctionIsAlwaysTrueOrFalseError(const Token* tok, const std::string &strFunctionName, const std::string &varName, const bool result);
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void checkSleepTimeError(const Token *tok, const std::string &strDim);
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void checkCastIntToCharAndBackError(const Token *tok, const std::string &strFunctionName);
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void checkPipeParameterSizeError(const Token *tok, const std::string &strVarName, const std::string &strDim);
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void oppositeInnerConditionError(const Token *tok);
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void clarifyCalculationError(const Token *tok, const std::string &op);
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void clarifyConditionError(const Token *tok, bool assign, bool boolop);
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void clarifyStatementError(const Token* tok);
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void redundantGetAndSetUserIdError(const Token *tok);
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void cstyleCastError(const Token *tok);
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void invalidPointerCastError(const Token* tok, const std::string& from, const std::string& to, bool inconclusive);
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void dangerousUsageStrtolError(const Token *tok, const std::string& funcname);
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void sprintfOverlappingDataError(const Token *tok, const std::string &varname);
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void udivError(const Token *tok, bool inconclusive);
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void passedByValueError(const Token *tok, const std::string &parname);
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void constStatementError(const Token *tok, const std::string &type);
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void charArrayIndexError(const Token *tok);
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void charBitOpError(const Token *tok);
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void variableScopeError(const Token *tok, const std::string &varname);
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void strPlusCharError(const Token *tok);
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void zerodivError(const Token *tok);
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void zerodivcondError(const Token *tokcond, const Token *tokdiv);
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void nanInArithmeticExpressionError(const Token *tok);
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void mathfunctionCallError(const Token *tok, const unsigned int numParam = 1);
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void cctypefunctionCallError(const Token *tok, const std::string &functionName, const std::string &value);
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void redundantAssignmentError(const Token *tok1, const Token* tok2, const std::string& var, bool inconclusive);
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void redundantAssignmentInSwitchError(const Token *tok1, const Token *tok2, const std::string &var);
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void redundantCopyError(const Token *tok1, const Token* tok2, const std::string& var);
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void redundantCopyInSwitchError(const Token *tok1, const Token* tok2, const std::string &var);
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void redundantBitwiseOperationInSwitchError(const Token *tok, const std::string &varname);
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void switchCaseFallThrough(const Token *tok);
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void suspiciousCaseInSwitchError(const Token* tok, const std::string& operatorString);
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void suspiciousEqualityComparisonError(const Token* tok);
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void selfAssignmentError(const Token *tok, const std::string &varname);
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void incorrectLogicOperatorError(const Token *tok, const std::string &condition, bool always);
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void redundantConditionError(const Token *tok, const std::string &text);
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void misusedScopeObjectError(const Token *tok, const std::string &varname);
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void memsetZeroBytesError(const Token *tok, const std::string &varname);
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void incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string);
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void incorrectStringBooleanError(const Token *tok, const std::string& string);
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void duplicateIfError(const Token *tok1, const Token *tok2);
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void duplicateBranchError(const Token *tok1, const Token *tok2);
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void duplicateExpressionError(const Token *tok1, const Token *tok2, const std::string &op);
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void alwaysTrueFalseStringCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void alwaysTrueStringVariableCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void suspiciousStringCompareError(const Token* tok, const std::string& var);
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void duplicateBreakError(const Token *tok, bool inconclusive);
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void unreachableCodeError(const Token* tok, bool inconclusive);
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void unsignedLessThanZeroError(const Token *tok, const std::string &varname, bool inconclusive);
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void pointerLessThanZeroError(const Token *tok, bool inconclusive);
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void unsignedPositiveError(const Token *tok, const std::string &varname, bool inconclusive);
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void pointerPositiveError(const Token *tok, bool inconclusive);
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void SuspiciousSemicolonError(const Token *tok);
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void doubleCloseDirError(const Token *tok, const std::string &varname);
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void moduloAlwaysTrueFalseError(const Token* tok, const std::string& maxVal);
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void negativeBitwiseShiftError(const Token *tok);
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void redundantCopyError(const Token *tok, const std::string &varname);
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void incompleteArrayFillError(const Token* tok, const std::string& buffer, const std::string& function, bool boolean);
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void varFuncNullUBError(const Token *tok);
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void commaSeparatedReturnError(const Token *tok);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
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CheckOther c(0, settings, errorLogger);
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// error
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c.sprintfOverlappingDataError(0, "varname");
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c.udivError(0, false);
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c.zerodivError(0);
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c.zerodivcondError(0,0);
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c.mathfunctionCallError(0);
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c.misusedScopeObjectError(NULL, "varname");
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c.doubleFreeError(0, "varname");
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c.invalidPointerCastError(0, "float", "double", false);
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c.negativeBitwiseShiftError(0);
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c.checkPipeParameterSizeError(0, "varname", "dimension");
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c.checkSleepTimeError(0,"dimension");
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//performance
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c.redundantCopyError(0, "varname");
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c.redundantCopyError(0, 0, "var");
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c.redundantAssignmentError(0, 0, "var", false);
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// style/warning
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c.checkComparisonFunctionIsAlwaysTrueOrFalseError(0,"isless","varName",false);
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c.checkCastIntToCharAndBackError(0,"func_name");
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c.oppositeInnerConditionError(0);
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c.cstyleCastError(0);
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c.dangerousUsageStrtolError(0, "strtol");
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c.passedByValueError(0, "parametername");
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c.constStatementError(0, "type");
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c.charArrayIndexError(0);
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c.charBitOpError(0);
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c.variableScopeError(0, "varname");
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c.strPlusCharError(0);
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c.redundantAssignmentInSwitchError(0, 0, "var");
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c.redundantCopyInSwitchError(0, 0, "var");
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c.switchCaseFallThrough(0);
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c.suspiciousCaseInSwitchError(0, "||");
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c.suspiciousEqualityComparisonError(0);
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c.selfAssignmentError(0, "varname");
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c.incorrectLogicOperatorError(0, "foo > 3 && foo < 4", true);
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c.redundantConditionError(0, "If x > 10 the condition x > 11 is always true.");
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c.memsetZeroBytesError(0, "varname");
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c.clarifyCalculationError(0, "+");
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c.clarifyConditionError(0, true, false);
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c.clarifyStatementError(0);
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c.incorrectStringCompareError(0, "substr", "\"Hello World\"");
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c.suspiciousStringCompareError(0, "foo");
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c.incorrectStringBooleanError(0, "\"Hello World\"");
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c.duplicateIfError(0, 0);
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c.duplicateBranchError(0, 0);
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c.duplicateExpressionError(0, 0, "&&");
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c.alwaysTrueFalseStringCompareError(0, "str1", "str2");
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c.alwaysTrueStringVariableCompareError(0, "varname1", "varname2");
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c.duplicateBreakError(0, false);
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c.unreachableCodeError(0, false);
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c.unsignedLessThanZeroError(0, "varname", false);
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c.unsignedPositiveError(0, "varname", false);
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c.pointerLessThanZeroError(0, false);
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c.pointerPositiveError(0, false);
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c.SuspiciousSemicolonError(0);
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c.cctypefunctionCallError(0, "funname", "value");
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c.moduloAlwaysTrueFalseError(0, "1");
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c.incompleteArrayFillError(0, "buffer", "memset", false);
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c.varFuncNullUBError(0);
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c.nanInArithmeticExpressionError(0);
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c.commaSeparatedReturnError(0);
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}
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static std::string myName() {
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return "Other";
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}
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std::string classInfo() const {
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return "Other checks\n"
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// error
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"* Assigning bool value to pointer (converting bool value to address)\n"
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"* division with zero\n"
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"* scoped object destroyed immediately after construction\n"
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"* assignment in an assert statement\n"
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"* incorrect length arguments for 'substr' and 'strncmp'\n"
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"* free() or delete of an invalid memory location\n"
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"* double free() or double closedir()\n"
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"* bitwise operation with negative right operand\n"
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"* provide wrong dimensioned array to pipe() system command (--std=posix)\n"
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"* cast the return values of getc(),fgetc() and getchar() to character and compare it to EOF\n"
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"* provide too big sleep times on POSIX systems\n"
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// warning
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"* either division by zero or useless condition\n"
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//performance
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"* redundant data copying for const variable\n"
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"* subsequent assignment or copying to a variable or buffer\n"
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// style
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"* Find dead code which is inaccessible due to the counter-conditions check in nested if statements\n"
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"* C-style pointer cast in cpp file\n"
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"* casting between incompatible pointer types\n"
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"* redundant if\n"
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"* bad usage of the function 'strtol'\n"
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"* [[CheckUnsignedDivision|unsigned division]]\n"
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"* passing parameter by value\n"
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"* [[IncompleteStatement|Incomplete statement]]\n"
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"* [[charvar|check how signed char variables are used]]\n"
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"* variable scope can be limited\n"
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"* condition that is always true/false\n"
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"* unusual pointer arithmetic. For example: \"abc\" + 'd'\n"
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"* redundant assignment in a switch statement\n"
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"* redundant pre/post operation in a switch statement\n"
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"* redundant bitwise operation in a switch statement\n"
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"* redundant strcpy in a switch statement\n"
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"* assignment of a variable to itself\n"
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"* Suspicious case labels in switch()\n"
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"* Suspicious equality comparisons\n"
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"* mutual exclusion over || always evaluating to true\n"
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"* Comparison of values leading always to true or false\n"
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"* Clarify calculation with parentheses\n"
|
|
"* suspicious condition (assignment+comparison)\n"
|
|
"* suspicious condition (runtime comparison of string literals)\n"
|
|
"* suspicious condition (string literals as boolean)\n"
|
|
"* suspicious comparison of a string literal with a char* variable\n"
|
|
"* duplicate break statement\n"
|
|
"* unreachable code\n"
|
|
"* testing if unsigned variable is negative\n"
|
|
"* testing is unsigned variable is positive\n"
|
|
"* Suspicious use of ; at the end of 'if/for/while' statement.\n"
|
|
"* incorrect usage of functions from ctype library.\n"
|
|
"* Comparisons of modulo results that are always true/false.\n"
|
|
"* Array filled incompletely using memset/memcpy/memmove.\n"
|
|
"* redundant get and set function of user id (--std=posix).\n"
|
|
"* Passing NULL pointer to function with variable number of arguments leads to UB on some platforms.\n"
|
|
"* NaN (not a number) value used in arithmetic expression.\n"
|
|
"* comma in return statement (the comma can easily be misread as a semicolon).\n";
|
|
}
|
|
|
|
void checkExpressionRange(const std::list<const Function*> &constFunctions,
|
|
const Token *start,
|
|
const Token *end,
|
|
const std::string &toCheck);
|
|
|
|
void complexDuplicateExpressionCheck(const std::list<const Function*> &constFunctions,
|
|
const Token *classStart,
|
|
const std::string &toCheck,
|
|
const std::string &alt);
|
|
};
|
|
/// @}
|
|
//---------------------------------------------------------------------------
|
|
#endif // checkotherH
|